Trapped in a basement with Sheriff Hirly Maple's raving zombie of a boyfriend, Jess—along with her undead girlfriend Olivia, and her very much still living friends Mason and Kokoro—learn about the hidden supernatural history of Broke Tree Valley and the Mammoth. Unfortunately, none of this newfound knowledge will help if they can't put a stop to the sheriff's sinister plan. Olivia seems to know the path to the Mammoth...but does she know a way out of this one?